Multi-mode electronic vehicle identification in the scene of multi-lane free flow

For the purpose of identifying as much as possible vehicles by means of short range vehicle-roadside communication, a kind of integrated multi-mode roadside unit (RSU) is proposed and designed to access 800/900 MHz passive, 2.4 GHz active, and 5.8 GHz semi-active onboard units. Furthermore, we present a deploying scheme of the RSUs in the scene of multi-lane free flow so as to realize comprehensive transportation information collection based on electronic vehicle identification.